Selection API

[pcuste1]

What is changing?

• Utilizes new "regionSelected" listener callback. This callback returns the type of the region drawn (circle, poly, or rect) as well as coordinates needed to define each of the regions. This is used by the python widget to create an astropy Region.
• Utilize new aladin.selectRegion to select objects by a predefined region

why is this needed?

• This API will be used by ipyaladin to give users programmatic access to the selection capabilities of aladin-lite. Users will be able to draw a selection in the aladin-lite widget, export that region, and then import it at a later time. This can aid in repeatability of notebook workflows, the saving of complex selections, and the linking of selection events across different tools to enable scientists needs.

related PRs

aladin-lite

Future work

• Expose models from aladin-lite for the different regions so that there is ensure consistency between these two packages
• Ensure that the math all works out for the different regions. Rectangles in particular might still need a little attention

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[pcuste1]

note: This PR is going to fail builds until the related aladin-lite PR is merged and used